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LWU420 User Manual-Technical Guide 020-000320-01 Rev. 1 (06-2010)
RS-232C Communication
RS-232C Communication
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CONTROL port RS-232C cable (Cross) RS-232C port
of the projector of the computer
- (1) (1) CD
RD (2) (2) RD
TD (3) (3) TD
- (4) (4) DTR
GND (5) (5) GND
- (6) (6) DSR
RTS (7) (7) RTS
CTS (8) (8) DTS
- (9) (9) RI
Connecting the cable
1.
Turn off the projector and the computer.
2.
Connect the CONTROL port of the projector with a RS-232C port of
the computer by a RS-232C cable (cross). Use the cable that fulfills the
specification shown in the previous page.
3.
Turn the computer on, and after the computer has started up turn the
projector on.
Communications setting
19200bps, 8N1
1. Protocol
Consist of header (7 bytes) + command data (6 bytes).
2. Header
BE + EF + 03 + 06 + 00 + CRC_low + CRC_high
CRC_low : Lower byte of CRC flag for command data
CRC_high : Upper byte of CRC flag for command data
3. Command data
Command data chart
byte_0 byte_1 byte_2 byte_3 byte_4 byte_5
Action Type Setting code
low high low high low high
Action (byte_0 - 1)
Action Classification Content
1 SET Change setting to desired value.
2 GET Read projector internal setup value.
4 INCREMENT Increment setup value by 1.
5 DECREMENT Decrement setup value by 1.
6 EXECUTE Run a command.